Improvement in let-off mechanism for looms



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BENJAMIN n. CARTER, oF wooNso'cKn'r, RHODE ISLAND, AssreNoR To HrMsnLR AND S. S. 000K, OF SAME PLACE.

Letters Patent No. 85,905, dated .Tamm/ry 19, 1869.

IMPROVEMENTIN LET-OIT MECHANISIYI FOR LOOMS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern:

Be it known that I, BENJAMIN F. CARTER, of Woonsocket, in the county of Providence, and in the State of Rhode Island, have invented a nevir and useful Improvement in Looms; and I do hereby declare that the following isa full, clear, and exact description thereoi,

reference being had to the accompanying drawings, which make part of this specification, and in which- Figure 1 represents a view in elevation of the endframe of a loom with my improvements attached, and .Figure 2, a plan or top view of the same. The object of my invention is to provide a-simple and efficient stop or let-oi motion for the yarn-beam of a loom, whereby the yarn-beam may be prevented from. turning during the operation of the` Aharnesses and beating in of the lay, but allowsitto let oft" whenthe lay is three inches from the cloth', 4thereby maintain- Aconnected to a vibrating whip-roll or lever `pivoted to the frame in a manner hereinafter to be described.

In the accompanying drawings, which show aconvenient arrangement of parts for carrying out ,the 0bject of my invention- A represents an end-frame of a beam, and

0, aratchet-wheel, having inner and outer teeth, c o upon it.V

This wheel is mounted in bearings in the frame A, upon one end of a shaft, which carries upon its opposite end 'a pinion, C', which gears with a toothed wheel upon the yarn-beam.

A lever, D, having a latch, d, upon it, near its free end, is pivoted upon the frame in such a manner that the latch d enters the space between the outer and inner teeth of the ratchet-wheel O, and gears with its inner and outer teeth according as it is depressed orelevated.r When in gear with the outer teeth, d, the ratchet-wheel G can only be moved in the direction of the red arrow, and consequently the yarn-beam can only be moved backwards.' When in gear with the inner teeth,c, the wheel O .can be moved only in the direction of the black arrow, and consequently allows the yarn-beam to turn forward, or in such direction as tosupply the yam to the reed or lay.

The movements of the lever D are effected by means of a vibrating whip-roll and lever, E, pivoted to the frame above the ratchet-wheel C, and operated by strain of yarn upon the'whip-roll attached. to lever E.

A carn-shoe, F, is securedto the longer arm of the lever E, which bears upon the cam G, while the balance-wheel, attached to the crank-shaft, makes a quarter revolution. 1

A rod, J, is hung to the shorter arm of the lever E, having change-weights, H, upon it, to act as a counter-balance to the strain of the yarn on the whip-roll,

attached to the lever E.

The upper change-weight is secured to the rod J by a set-screw, K, the head of which is countersunk in a recess in the weight, so that it cannot be slacked to remove the weight except by the use of a key or wrench of suitable construction, which is only to be carried by the'overseer, so as to prevent the Weavers from changing the weights, to cause'the looms to weave faster.

The weights hang in a box, h, secured to the frame, by which means they are prevented from swinging or being jostled during the operation of the loom.

A rod, I, is pivoted to the lever E, andpasses through a hole in a collar, d', upon the lever D, having secured upon it the collars Il and l2. l

Aspiral spring; t', surrounds the rod I, between its lower collar, I2, and the collar d of the lever D, against which it presses.

The tendency of the spring isto press upward, and when the shoe F is raised by the 'cam G, it presses against the collar d', and-forces the latch d up into gear. with the outer teeth, G', of the ratchet-wheel C, thereby preventing the latter from moving in the direction of the black arrow, and consequently holding the yarn-beam stationary during the backward movement of the reed or lay. When the lever E descends,`

the collar Il bears upon the collar d', and forces the latch l into gear with the inner teeth, O. When in this position, which is during the forward throw of tbe lay, the yarn-beam can move in proper direction to supply the yarn at the proper tension.

The cam G is so set as to raise the lever E when the reed or lay is within three (or about) inches of the' cloth, whether worked forward or backward, so as not to let oii by the operation Vof theharnesses or lay, but whollyby the strain of the yarn.

It will be seen that when the latch d is in gear with the outer teeth, e', the spring i allows the yarn-beam to be turned backward, if occasion should-require it,

but holds it firmly from moving forward, or in such direction as to allow'the yarn to slacken'.

Having thus fully described my invention,

Yhat l claim therein as new, and desire to secure by, etters Patent, is

The pivoted lever D, or its equivalent, latch d, and double-ratchet. Wheel O, in combination .with the vibrating whip-roll and lever E, rod I, and springe, substantially as and for the purpose described. A

The above specification signed by me, this 31st day of August, A. D. 1868.

`BllNJAlMIIN F. CARTER.

Witnesses ALPHoNs STEERR, CHARLES S. LANDERS. 

